JP2004223660A - Bush press fitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve handleability of a pressing tool when forcibly fitting an elastic bush covered with the pressing tool by a press fitting member after temporarily inserting the bush into a bush insertion hole in advance. <P>SOLUTION: The elastic bush 4 covered with the pressing tool 16 is forcibly fitted into a collar 3 by a press fitting head 13 after temporarily inserting the bush 4 into the collar 3 in advance. A chuck 21 is attached to the press fitting head 13 and the pressing tool 16 is chucked by the chuck 21 at an initial stage after starting press fitting. In a process in which the press fitting head 13 ascends after completion of press fitting, the pressing tool 16 chucked by the chuck 21 is taken out of the elastic bush 4 as it is. As a result, the pressing tool 16 is not required to be removed by a worker each time after completion of press fitting of the bush 4. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a device for press-fitting a bush (elastic bush) mainly made of an elastic member such as rubber into a work, and particularly to a device for pressing a bush when press-fitting the bush with a pressing jig placed on the bush. The present invention relates to a bush press-fitting device capable of simplifying handling of a jig.
[0002]
[Prior art]
For example, an elastic bush called an insulator is press-fitted into a portion of a suspension member of an automobile which is to be a mount portion on the vehicle body side, and a device for press-fitting the elastic bush into a bush insertion hole is described in Patent Document 1. Are known.
[0003]
In the technique described in Patent Literature 1, while a suspension member is positioned and fixed on a work support table, a holding member and a guide member that previously support an elastic bush are provided above the suspension member, and the elastic bush is passed through the guide member. And press-fit into the bush insertion hole of the suspension member below it while reducing the diameter.
[0004]
[Patent Document 1]
JP 2000-263350A (FIG. 1)
On the other hand, when the elastic bush is required to have directivity in the rotating direction when press-fitting the elastic bush, the elastic bush is temporarily inserted into the bush insertion hole without being supported by the support member in advance, and then press-fitted from above. In some cases, it is more convenient to push in with a member.
[0005]
For example, with reference to FIG. 2 showing an embodiment of the present invention, the elastic bush 4 is formed with a hollow portion 9 passing through the elastic bush 4 in the axial direction, In the case where the projection 10 is partially formed on the end face, the phase in the rotation direction is adjusted in the press-fitting into the mating bush insertion hole from the viewpoints of steering stability, soundproofing, and vibration-proofing performance. There is a need.
[0006]
Therefore, as shown in FIG. 7A, the collar 3 functioning as a bush insertion hole of the suspension member 1 is put on the work receiving base 50 and positioned, while the elasticity is increased as shown in FIG. After inserting the pushing jig 51 into the bush 4 and engaging the projection 10 on the elastic bush 4 side with the notch 52 on the pushing jig 51 side, the relative positioning in the rotation direction is performed. The elastic bush 4 is temporarily inserted into the collar 3 as shown in FIG. In addition, in these series of operations, the operations other than the loading of the suspension member 1 are performed manually. At this time, since the guide tube 53 on the workpiece receiving table 50 side and the guide shaft 54 on the pushing jig 51 side have the relationship between the deformed hole and the deformed rod as in FIG. By fitting them together, the relative positioning of the collar 3 as the bush insertion hole and the elastic bush 4 in the rotational direction is performed via the work receiving table 50 and the pressing jig 51.
[0007]
When the press-fitting member 55 is lowered by the press-fitting cylinder 56 in this state, a pressure input acts on the elastic bush 4 via the pressing jig 51 as shown in FIG. Is correctly pressed into the collar 3 while maintaining the relative positioning state.
[0008]
[Problems to be solved by the invention]
In such a conventional technique, when carrying out the suspension member 1 after the bush press-fitting is completed, the suspension member 1 cannot be taken out without removing the pushing jig 51 in advance as shown in FIG. 8C. However, extra steps are required, which is not preferable. Further, since the suspension member 1 after the completion of the bush press-fitting operation is taken out, the next suspension member 1 is loaded, and the pushing jig 51 removed earlier is set and reused. A jig table for storing the pressing jig 51 is required each time, and the space efficiency of the equipment is deteriorated.
[0009]
The present invention has been made in view of such a problem, and in particular, provides a bush press-fitting device in which the handling property of a pressing jig is improved while assuming the conventional bush press-fitting procedure shown in FIGS. It is assumed that.
[0010]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a work receiving table for positioning and supporting a work, and a press-fitting member which is arranged to face the work receiving table and can move up and down with respect to the work receiving table. Temporarily insert a bush into the bush insertion hole of the work, place a pressing jig on the bush, press the bush via the pressing jig by the downward movement of the press-fitting member, and insert the bush into the bush. It is assumed that the device is to be pressed into the hole. Then, a chuck is provided on the press-fitting member to hold the pressing jig at the time of the bush press-fitting operation by the press-fitting member. It is characterized in that it is taken out from the bush after the press-fitting is completed.
[0011]
More specifically, for example, when a bush having a cylindrical shape is press-fitted into a bush insertion hole, a directionality in a rotational direction is required. After performing relative positioning in the rotational direction with the jig, and temporarily inserting the bush into the bush insertion hole, perform relative positioning in the rotational direction between the pressing jig and the work pedestal. Assume that relative positioning of the bush and the bush insertion hole in the rotation direction is performed via the work receiving base.
[0012]
According to a fourth aspect of the present invention, the chuck autonomously grips the pressing jig according to the relative displacement between the pressing jig and the chuck accompanying the lowering operation of the press-fitting member. desirable.
[0013]
More desirably, as described in claim 5, the chuck that has been lifted and returned together with the press-fitting member is stored while holding the pressing jig in a gripped state until the pressing jig is required in the bush press-fitting operation in the next cycle. The posture of the pushing jig placed on the bush prior to the bush press-fitting operation coincides with the posture of the pushing jig gripped by the chuck, which also serves as a jig mounting table. Is set as follows.
[0014]
Therefore, at least in the first aspect of the present invention, the removal of the pressing jig after the completion of the bush press-fitting operation is automatically performed by the chuck attached to the press-fitting member. As described above, the chuck also serves as a jig mounting table for holding the pushing jig in a gripped state until the pushing jig is required in the next cycle of the bush press-fitting operation, and the bush press-fitting is performed. If the posture of the pushing jig placed on the bush prior to the operation is set so that the posture of the pushing jig held by the chuck matches, the bush is moved in the next cycle by the lifting operation of the press-fitting member. And stored until needed. Therefore, the operator does not need to be involved at least in removing the pushing jig after the press-fitting operation of the bush is completed.
[0015]
【The invention's effect】
According to the first aspect of the present invention, the pushing jig is removed autonomously by the raising operation of the press-fitting member after the completion of the bush press-fitting. Therefore, at least the worker needs to be involved in the work of removing the pushing jig. This has the effect of reducing work steps and improving workability. In addition, if the pressing jig is moved to the storage state by raising the press-fitting member, there is no need to separately install a jig mounting table for storing and managing the pressing jig, so that the space efficiency of the equipment can be improved. Become.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
1 to 6 show a preferred embodiment of the present invention. In particular, FIGS. 1A and 1B show a schematic structure of a suspension member of an automobile, and FIG. 2 shows an elastic bush used for the suspension member. Are shown respectively.
[0017]
As shown in FIGS. 1A and 1B, cylindrical collars 3 are fixed by welding or the like to four corners of a member body 2 of a suspension member 1 serving as a work, which are to be mounted on the vehicle body side. An elastic bush 4 made of an elastic material such as rubber, that is, an elastic bush (hereinafter simply referred to as a bush) 4 shown in FIG. A front mount insulator 5 and a rear mount insulator 6 are formed.
[0018]
Here, the bush 4 shown in FIG. 2 is a cylindrical body in which an elastic body 8 such as rubber is integrally formed around a metal inner cylinder 7, and penetrates the elastic body 8 in, for example, an axial direction. A cavity (gap) 9 is formed, and a projection 10 as a positioning engagement portion is integrally formed on one end surface. The bush 4 has a specific directionality in the X and Y directions and the rotation direction (circumferential direction) from the viewpoint of steering stability, soundproofing, vibration isolation performance, and the like, that is, has a predetermined phase relationship with the collar 3 on the other side. Press-fit while performing relative positioning in the rotational direction as described above. The elastic body 8 may have a metal outer cylinder buried in a portion close to the outer peripheral surface, or may have a metal outer cylinder inserted so as to surround the elastic body 8.
[0019]
The work of press-fitting the bush 4 is performed independently for each collar 3 with, for example, the member body 2 of the suspension member 1 placed horizontally, and an example of a bush press-fitting device for press-fitting the bush 4 is shown in FIG. Shown in
[0020]
As shown in FIG. 3A, a circular work receiving base 12 having a fixed position is disposed on the pedestal 11, and a press fit capable of vertically moving the work receiving base 12 is provided above the work receiving base 12. The press-fit head 13 is disposed as a member facing the same. A guide tube 14 is provided upright at a central portion of the work receiving base 12 so that the collar 3 of the suspension member 1 is received by the work receiving base 12 to perform the positioning thereof. Is designed to move up and down in response to the expansion and contraction of a press-fit cylinder (hydraulic cylinder or air cylinder) 15. In addition, as described later, the tip end surface 13a of the press-fit head 13 that comes into contact with the pressing jig 16 when the bush 4 is press-fitted is formed as a spherical surface.
[0021]
Prior to the press-fitting operation, a dedicated pressing jig 16 is placed on the upper surface of the bush 4. The pushing jig 16 has a guide rod 18 suspended from the center of a circular top plate 17 having a tapered portion 17a at the peripheral edge. A projection on the bush 4 side shown in FIG. A cutout portion 19 is formed as a positioning engagement portion capable of engaging with the portion 10 in an uneven manner. As shown in FIG. 4, engagement grooves 20 having a so-called two-sided width shape are formed at two opposing outer peripheral portions of the top plate 17. The engagement groove 20 functions as a holding portion (chucking portion) by a chuck 21 described later. The projection 10 on the bush 4 side and the notch 19 on the pushing jig 16 are engaged with each other so that they can be temporarily positioned relative to each other in the rotational direction.
[0022]
Here, the guide tube 14 on the work receiving table 12 side and the guide shaft 18 on the pushing jig 16 side are in a relation that they can be inserted into each other so as not to rotate relative to each other. For example, as shown in FIG. The guide shaft 18 has the same shape as the positioning engagement portion, whereas the guide shaft 18 has the same shape as that of the positioning engagement portion, whereas the guide shaft 18 has the same shape as the positioning engagement portion. It is formed as a deformed rod having the same cross-sectional shape and having a flat surface 18a in a part of the direction.
[0023]
Therefore, when the bush 4 is temporarily inserted into the collar 3 as described later, it is necessary to insert the bush 4 while aligning the phases of the guide tube 14 on the work receiving base 12 and the guide shaft 18 on the pushing jig 16 in the rotational direction. Accordingly, the relative positioning of the bush 4 with respect to the collar 3 in the rotational direction is performed via the work receiving table 12 and the pressing jig 16.
[0024]
A chuck 21 capable of gripping the pressing jig 16 is mounted on the press-fitting head 13 that controls the press-fitting of the bush 4. As shown in FIG. 6, the chuck 21 has a pair of left and right openable chuck claws 23 rotatably supported via hinge pins 24 on a chuck body 22 fixed to the press-fit head 13. 23 is urged in the chucking direction by a compression coil spring 25, and the opening in the chucking direction is regulated by a stopper bolt 26. As shown in FIG. 4, the chuck claw 23 engages with the engaging groove 20 having a two-sided width on the pressing jig 16 side and chucks the portion as a gripping portion. The claw 23 stably chucks the pushing jig 16 while regulating the posture of the pushing jig 16 in the rotation direction.
[0025]
According to the bush press-fitting device configured as described above, as shown in FIG. 3A, the suspension member 1, which is a work, is placed on the work cradle 12 with the press-fit head 13 waiting at the ascending limit position. The work 3 is received and the collar 3 is received by the work receiving base 12 to perform the positioning. The loading of the suspension member 1 may be performed by an automated machine such as a handling robot, or may be performed manually. Further, as is apparent from FIG. 3, the chuck claw 23 of the chuck 21 is in an empty chucking state at this time.
[0026]
Next, the bush 4 is manually taken out from a bush stocker (not shown) or the like, and a pushing jig 16 prepared in advance is placed over the bush 4, and the guide shaft 18 on the pushing jig 16 side is connected to the inner cylinder of the bush 4. The projection 10 (see FIG. 2) on the side of the bush 4 and the notch 19 on the side of the pressing jig 16 are engaged with each other while being inserted into the section, and the relative positioning of the two in the rotational direction (circumferential direction) is performed. . When the relative positioning between the bush 4 and the pressing jig 16 has been performed, the end of the bush 4 is temporarily inserted into the collar 3 while the work receiving table 12 is being inserted as shown in FIG. The guide tube 14 on the side and the guide shaft 18 on the pressing jig 16 are inserted into each other while adjusting the phase in the rotation direction. As a result, the collar 3 and the bush 4 to be press-fitted into the collar 3 are positioned relative to each other in the rotational direction, that is, the phase is adjusted via the work receiving table 12 and the pressing jig 16.
[0027]
When the temporary insertion of the bush 4 is completed in this way, the operator separates from the equipment and turns on the start switch. As a result, the press-fit cylinder 15 extends and the press-fit head 13 starts a lowering action. When the press-fitting head 13 descends, each chuck claw 23 on the chuck 21 side is slightly tapered before the press-fitting head 13 comes into contact with the pressing jig 16 as shown in FIG. It comes into contact with the portion 17a. Due to this taper contact, each chuck claw 23 is pushed open, and each chuck claw 23 engages with the engagement groove 20 having a width across flat surface when the chuck claw 23 has passed over the tapered portion 17a. The pressing jig 16 is mechanically chucked by the chuck 21 as a grip. That is, the pushing jig 16 is stably chucked while the posture in the rotation direction is regulated. Almost simultaneously with the completion of the chucking, the distal end surface 13a of the press-fit head 13 comes into contact with the top plate 17 of the pressing jig 16.
[0028]
Further, when the press-fit head 13 moves downward, the press-fit by the press-fit head 13 is applied to the bush 4 via the pressing jig 16, and the bush 4 is press-fitted into the collar 3 functioning as a bush insertion hole. At this time, the chuck 21 still holds the pressing jig 16 in the chucking state. In addition, since the tip end surface 13a of the press-fit head 13 has a spherical surface and makes a point contact with the top plate 17 of the pressing jig 16, the axis of the collar 3 and the axis of the bush 4 coincide with each other. The bush 4 is moved in the initial rotation direction because the guide effect is exerted by the engagement of the guide tube 14 on the workpiece receiving table 12 side and the guide rod 18 on the pushing jig 16 side. Is smoothly pressed into the collar 3 while maintaining the relative positioning state. The contact between the press-fit head 13 and the top plate 17 of the pressing jig 16 may be a spherical contact with a concave spherical surface and a convex spherical surface instead of the point contact.
[0029]
When the press-fit head 13 is lowered by a predetermined stroke to finish the press-fitting of the bush 4, the press-fit head 13 starts to rise again from the lower limit position, returns to the initial position as shown in FIG. I do. In the process of raising the press-fitting head 13, the chuck 21 still holds the pressing jig 16, so that the chuck 21 moves up with the press-fitting head 13 and pushes the pressing jig 16 from the bush 4 into which the press-fitting 16 has been press-fitted. The press-fit head 13 is finally detached and stands by at the stop position of the press-fit head 13, that is, the state shown in FIG.
[0030]
When the press-fit head 13 rises in this way, the bush press-fitting operation for one suspension member 1 is completed with this, and the suspension member 1 after the bush press-fitting is carried out to the next process by an automatic machine or manually, while being replaced. As a result, a new suspension member 1 in which the bush 4 is not press-fitted is thrown in, and is positioned on the work receiving base 12 in the same manner as in the previous case.
[0031]
Thereafter, as in the previous case, the operator takes out the bush 4 manually from a bush stocker (not shown) or the like, and temporarily inserts the pushing jig 16 into the collar 3 after covering the bush 4. Become.
[0032]
At this time, the chuck 21 holding the pressing jig 16 is standing by right above the collar 3 in the bush unpressed state, and therefore, the operator takes out the pressing jig 16 from the chuck 21 attached to the pressing head 13. The bush 4. That is, as is apparent from FIG. 4, the chuck claw 23 of the chuck 21 only grips the pressing jig 16 with the engagement groove 20 having a two-sided width as a gripping portion. When the jig 16 is pulled out, the pushing jig 16 can be separated from the chuck 21 and easily taken out.
[0033]
In other words, since the posture when the pressing jig 16 is covered on the bush 4 and the posture of the pressing jig 16 that is gripped by the chuck 21 at the ascending limit position of the press-fit head 13, match. What is necessary is just to cover the bush 4 with the pushing jig | tool 16 pulled out from the chuck 21 as it is, and it is extremely excellent in workability. Moreover, as long as the chuck 21 is at the ascending limit position together with the press-fitting head 13, the chuck 21 substantially doubles as the mounting table of the pressing jig 16, so that a separate mounting table for storing the pressing jig 16 is prepared. There is no necessity, and this is advantageous in terms of space efficiency of equipment.
[0034]
After the setting of the pressing jig 16 and the temporary insertion of the bush 4 into the collar 3 are completed, the bush 4 is press-fitted by the lowering operation of the press-fit head 13 in the same manner as in the previous case. Will be repeated.
[0035]
As described above, according to the present embodiment, there is no need to involve an operator in taking out and storing the push jig 16 after the completion of the press-fitting of the bush as in the related art. It can be improved.
[0036]
Here, the effects of the present embodiment other than those described in the column of the effects of the above-described invention are listed below together with the causes thereof.
[0037]
(1) Not only is the relative positioning in the rotational direction of the bush 4 and the pressing jig 16 performed by the concave and convex engagement, but also the guide tube 14 on the work receiving table 12 side and the guide shaft on the pressing jig 16 side. Since the relative positioning and the guiding effect in the rotation direction are exhibited also by the engagement with the bushing 18, the phase of the bush 4 is not shifted during the press-fitting operation, the press-fitting accuracy of the bush 4 is improved, and the press-fitting work is performed. It can be done smoothly.
[0038]
(2) The gripping or chucking of the pressing jig 16 by the chuck 21 is autonomously performed by taper contact based on the relative displacement of the chuck 21 and the pressing jig 16 in the vertical direction. No actuator is required for unchucking, and the structure can be simplified and downsized.
[0039]
(3) The chuck 21 that rises and stands by together with the press-fitting head 13 also substantially serves as a table for the pushing jig 16, and stores the pushing jig 16 while the suspension member 1 is being replaced. Therefore, there is no need to separately provide a mounting table for the pressing jig 16 as in the related art, which is advantageous in terms of space.
[0040]
(4) The posture of the pressing jig 16 held by the chuck 21 that is raised and waiting together with the press-fit head 13, and the posture of the pushing jig 16 when it is put on the bush 4 prior to the bush press-fitting operation. Therefore, there is an advantage that the removal of the pushing jig 16 from the chuck 21 and the subsequent operation of attaching the pushing jig 16 to the bush 4 can be performed very quickly and easily.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic structure of a suspension member of an automobile as an example of a work to be subjected to a bush press-fitting operation, in which (A) is a plan view and (B) is a right side view in FIG. .
FIG. 2 is a perspective view showing a schematic structure of a bush to be pressed into the suspension member of FIG. 1;
3A and 3B are diagrams showing a structure of a main part of the bush press-fitting device as a preferred embodiment of the present invention, wherein FIG. 3A is an explanatory diagram before the bush press-fitting, FIG. Explanatory drawing which shows the state after bush press-fit completion.
FIG. 4 is an explanatory plan view of the pressing jig shown in FIG.
FIG. 5 is a perspective view showing a relationship between a work receiving table and a pressing jig.
FIG. 6 is an enlarged view of the chuck shown in FIG.
FIGS. 7A to 7C are process explanatory views showing a conventional bush press-fitting procedure.
FIGS. 8A to 8C are process explanatory diagrams showing a bush press-fitting procedure following FIG. 7;
[Explanation of symbols]
1. Suspension member (work)
3. Collar (Bushing insertion hole)
4 Elastic bush 8 Elastic body 10 Projection (positioning engagement part)
12 Workpiece support 13 Press-fit head (press-fit member)
14 ... Guide tube (positioning engagement part)
15 ... Press-fit cylinder 16 ... Pressing jig 17a ... Taper part 18 ... Guide rod (positioning engagement part)
19: Notch (positioning engagement part)
Reference numeral 20: engagement groove 21: chuck 23: chuck claw

Claims (6)

A work receiving base for positioning and supporting the work, and a press-fitting member arranged opposite to the work receiving base and capable of moving up and down with respect to the work receiving base, wherein a bush is inserted into a bush insertion hole of the work on the work receiving base. A device in which the push jig is placed on the bush while being temporarily inserted, and the bush is pressed through the push jig by the lowering operation of the press-in member to press-fit the bush into the bush insertion hole. So,
The press-fitting member is provided with a chuck for gripping the pressing jig during the bush press-fitting operation by the press-fitting member,
A bush press-fitting device characterized in that, when the press-fitting member is raised after the bush press-fitting is completed, the pressing jig held by the chuck is taken out of the bush after the press-fitting is completed. When press-fitting the cylindrical bush into the bush insertion hole, the directionality of the rotation direction is required,
By performing relative positioning in the rotational direction between the bush and the pressing jig, and temporarily inserting the bush into the bush insertion hole, relative positioning in the rotating direction between the pressing jig and the work receiving base is performed.
The bush press-fitting device according to claim 1, wherein relative positioning of the bush and the bush insertion hole in the rotation direction is performed via the pushing jig and the work receiving base. The bush and the pressing jig are each formed with a positioning engagement portion that engages with each other for relative positioning in the rotation direction, and
3. The bush press-fitting device according to claim 2, wherein the pressing jig and the work pedestal are respectively formed with positioning engagement portions that engage with each other for relative positioning in the rotation direction of the both. 4. The chuck according to claim 1, wherein the chuck autonomously grips the pressing jig in accordance with a relative displacement between the pressing jig and the chuck accompanying the lowering operation of the press-fitting member. 3. The bush press-fitting device according to item 1. The chuck, which has been raised and returned together with the press-fitting member, also serves as a jig mounting table for holding the pressing jig in a gripped state until the pressing jig is needed in the next cycle of the bush press-fitting operation. Item 5. A bush press-fitting device according to any one of Items 1 to 4. The push jig placed on the bush prior to the bush press-fitting operation is set so that the attitude of the push jig held by the chuck matches the attitude of the push jig. A bush press-fitting device according to any one of the above.

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