JP4099892B2 - Bush press-fitting device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bush press-fitting device for press-fitting a bush made of an elastic member into a through hole of a workpiece.
[0002]
[Prior art]
For example, a suspension of an automobile exhibits an anti-vibration and sound-proof effect by connecting an arm, a link, etc. (hereinafter referred to as a work) and a vehicle body via a rubber bush.
[0003]
For the press-fitting of the rubber bush into the work, a bush press-fitting device is used. As a conventionally used bush press-fitting device, for example, there is a device shown in FIGS. FIG. 4 is a cross-sectional view showing the bush press-fitting device, and FIG. 5 is a cross-sectional view along the line 5-5 in FIG. 6B described later, showing the relationship between the clamp member and the guide member.
[0004]
This bush press-fitting device press-fits a rubber bush B with a flange into a work W, and clamps a cylindrical work support (work support member) 1 and a work W placed on the work support 1. The clamping member 2, the guide rubber member 3 for making it easier to enter the rubber bush B with the hook into the bush insertion hole Ow of the workpiece W, and can be moved up and down by driving means such as a hydraulic cylinder (not shown) directly above the guide member 3. And a ram (holding member) 4 configured to hold the rubber bush B, and these members are arranged coaxially.
[0005]
The work support 1 has a step 1a having an inner diameter larger than the bush insertion hole Ow of the work W so that the flange b1 below the rubber bush B enters the top, and the bush return to the internal space 1b. A member 5 is provided.
[0006]
The bush return member 5 is connected to the ram 4 via an arm 6 having a U-shaped cross section, and moves up and down as the ram 4 moves up and down. Is used to return the upper flange b2 to the top of the workpiece W.
[0007]
As shown in FIG. 5, the clamp member 2 has a pressing piece 2a having a C-shape so that the workpiece W can be pressed and held without covering the bush insertion hole Ow of the workpiece W. The rubber bush B can be fitted into the bush insertion hole Ow of the workpiece W through the internal space 2b of the pressure piece 2a.
[0008]
The guide member 3 includes a main body 3a in which a tapered through hole O3 is formed so that the rubber bush B is once compressed below the inner diameter of the bush insertion hole Ow, a protrusion 3b protruding from the main body 3a, A support shaft 3c provided through the protrusion 3b and supporting the entire guide member 3 so as to be movable up and down, and a spring 3d provided on the support shaft 3c and constantly repelling the guide member 3 upward. ing.
[0009]
The support shaft 3c is fixedly attached to a predetermined position of the bush press-fitting device.
[0010]
The ram 4 includes a relatively large diameter base portion 4a and a relatively small diameter bush mounting portion 4b formed at the lower end of the base portion 4a, and a step formed between the base portion 4a and the bush mounting portion 4b. The rubber bush B is held so as not to be retractable by the portion 4c and is press-fitted into the workpiece W. The bush mounting portion 4b is configured such that the sleeve 7 to which the rubber bush B is mounted can be easily detached.
[0011]
In order to press-fit the rubber bush B into the workpiece W by using this bush press-fitting device, first, as shown in FIG. 6A, the sleeve 7 of the rubber bush B is attached to the bush mounting portion 4b of the ram 4, while the work support base is mounted. The workpiece W is placed on 1 and clamped by the clamp member 2.
[0012]
Next, as shown in FIG. 6B, the ram 4 is lowered. Thereby, the rubber bush B is lowered while being compressed by the tapered through hole O3 of the guide member 3 to be equal to or smaller than the inner diameter of the bush insertion hole Ow. In this case, the guide member 3 descends through the internal space 2b formed in the pressure piece 2a of the clamp member 2 and moves toward the bush insertion hole Ow.
[0013]
As shown in FIG. 6C, when the rubber bush B fits into the bush insertion hole Ow of the workpiece W beyond the guide member 3, the guide member 3 is returned to the original position by the elastic force of the spring 3d. Return.
[0014]
Further, when the ram 4 is lowered by a predetermined stroke t (overstroke), as shown in FIG. 6 (D), the flange b1 below the rubber bush B expands by its own elasticity, and is engaged with the lower part of the work W. Match.
[0015]
When the lower flange b1 expands, the ram 4 is raised and the rubber bush B is pushed back by a predetermined amount by the bush return member 5. As a result, the flange b2 above the rubber bush B expands by its own elasticity, engages with the upper part of the workpiece W, and the rubber bush B is attached to the bush insertion hole Ow of the workpiece W.
[0016]
[Problems to be solved by the invention]
However, in this bush press-fitting device, after the work W is placed on the work support 1, the work W must be clamped by the clamp member 2 before the rubber bush B is press-fitted, and the press-fitting of the rubber bush B is completed. After that, when the workpiece W is removed from the workpiece support 1, an operation of unclamping is required.
[0017]
The necessity of such work is accompanied by troublesome work when mass production or production by flow work is performed, and there is a problem that work efficiency and thus productivity is lowered.
[0018]
The present invention has been made in order to solve the above-described problems of the prior art, and the workpiece can be clamped and unclamped only by the relative proximity and separation of the holding member for press-fitting the bush and the workpiece support member. An object is to provide a bush press-fitting device with good work efficiency.
[0019]
[Means for Solving the Problems]
The object of the present invention is achieved by the following means.
[0020]
(1) a holding member for holding a bushing made from both ends flanged elastic member, when lowered toward the workpiece support member workpiece is placed, the bushing insertion hole and reduced diameter of the bush is established in the work In the bush press-fitting device, the guide member for reducing the diameter of the bush and guiding it to the bush insertion hole and the clamp part for clamping the work on the work support member are integrally formed. The workpiece is clamped between the holding member and the workpiece support member by the relative proximity operation of the support member, and the workpiece is clamped between the workpiece support member, and the holding member and the workpiece support member are moved relative to each other. Ascended between the holding member and the workpiece support member so as to be separated from the workpiece on the workpiece support member and put the workpiece in an unclamped state. A pressure guide member arranged to be able to descend, and provided on the pressure guide member, and when the bush is press-fitted into the bush insertion hole, the pressure guide member itself cannot be retracted to the opposite side of the press-fitting direction. a locking mechanism, vertically movably provided on the workpiece support member, acting from below the bushing which is press-fitted into the bushing insertion hole, the upper flange portion of the flange portion by returning the bushing upwardly A bush return member to be engaged with the workpiece, and when the holding member descends, the lower end of the bush descends beyond the bush insertion hole of the workpiece, thereby lowering the lower collar in the collar portion. part was a engaged with the workpiece, when raised, to characterized in that the bush return arm that connects the holding member and the member is configured to unlock said locking mechanism Bush press-fit equipment.
[0023]
(2) The locking mechanism includes a locking portion provided so as to be able to protrude and retract from the pressure guide member, and a holder that is locked when the locking portion protrudes and holds the arm at one end. When, to release the locked state by the locking between the holder and the locking portion by the lifting operation before Symbol arm bushing press-fitting apparatus (1) having a cam portion provided in the arm.
[0024]
(3) When the pressure guide member is in a locked state in which the locking portion is locked to the holder, a distance (L1) between the upper end surface of the pressure guide member and the upper end surface of the bush is the pressure guide. bush press-fit device of the characterized by being configured to be smaller than the distance to the bottom surface and the lower end surface of the work member (L2) (1) or (2).
[0025]
【The invention's effect】
In the first aspect of the present invention, the pressure guide member is formed by integrating the guide portion that reduces the bush diameter and guides it to the bush insertion hole, and the clamp portion that clamps the work on the work support member. Since the number of parts is reduced, the configuration is simplified, and the workpiece can be clamped and unclamped by the relative proximity and separation of the holding member and the workpiece support member, so that workability and productivity are remarkably improved. In addition, when the bush is press-fitted into the bush insertion hole, a lock mechanism is provided to lock the pressure guide member so that it cannot be retracted. Therefore, the bush is held at the initial stage of the relative separation between the holding member and the workpiece support member after the bushing is pressed. It becomes easy to remove | deviate from a member, and workability | operativity improves also in this point. Furthermore, since the lock mechanism is unlocked by the lifting and lowering operation of the arm connecting the bush return member and the holding member, the workpiece can be easily unclamped, and the workability is improved in this respect as well.
[0028]
According to the second aspect of the present invention, the cam portion is provided in the arm slidably held by the holder, and the cam portion releases the locked state between the locking portion and the holder by the lifting and lowering operation of the holding member. Therefore, an expensive control device is not required, a simple configuration is sufficient, and equipment costs can be reduced.
[0029]
In the invention according to claim 3 , since the distance between the upper and lower end surfaces of the pressure guide member and the rubber bush or the end surface of the workpiece is set to a predetermined value in the locked state, the flanges provided at both ends of the bush are It can be easily opened, and the press-fitting operation can be performed easily and reliably even with a bush having flanges at both ends.
[0030]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0031]
1 is a cross-sectional view showing a rubber bush press-fitting device according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1, and FIGS. The same reference numerals are given to members common to the members shown in FIGS. 4 to 6, and a part of the description may be omitted.
[0032]
As shown in FIG. 1, the rubber bush press-fitting device according to the present embodiment presses a rubber bush B with hooks on both ends into a work W.
[0033]
The workpiece W on the workpiece support 1 is placed so that the bush insertion hole Ow is coaxial with the internal space 1b of the workpiece support 1. In this embodiment, the workpiece W is the clamp member 2. And the function of the guide member 3 are held by the pressure guide member 20, and the pressure guide member 20 is locked by the lock mechanism 22 so as not to be retracted when the bush B is press-fitted into the bush insertion hole Ow. It has become so.
[0034]
As shown in FIG. 2, the pressure guide member 20 is a flat plate in which a mortar-shaped through hole 21 is formed so that the rubber bush B is once compressed below the inner diameter of the bush insertion hole Ow.
[0035]
The locking mechanism 22 includes a locking portion 24 provided in a sliding groove 23 formed in the base portion 20a of the pressure guide member 20, and a first portion that repels the locking portion 24 outward. A spring 25, a support shaft 26 that is provided through the base portion 20a and supports the entire pressure guide member 20 so as to be movable up and down, and is provided on the support shaft 26 so that the pressure guide member 20 is always moved upward. It has the 2nd spring 27 which repels.
[0036]
The locking portion 24 includes a locking portion main body 24a provided in the sliding groove portion 23, and a claw portion 24b protruding in the width direction from the locking portion main body 24a at the tip of the locking portion main body 24a. Have.
[0037]
The claw portion 24b is adapted to be engaged with a flange portion 28a formed at the tip of a holder 28 provided in a fixed position. The holder 28 connects the ram 4 and the bush return member 5 to each other. It is provided so as to hold the arm 6 having a U-shaped cross section and constitutes a part of the lock mechanism 22.
[0038]
However, the distal end surface of the locking portion main body 24 a is in contact with the abdominal surface 6 a of the arm 6, and the second cam 27 is elastically repelled by a tapered cam portion 6 b provided on the abdominal surface 6 a of the arm 6. The locking portion 24 is pushed back against the force.
[0039]
A recess 23 a into which the claw portion 24 b enters when the locking portion 24 is retracted is formed in the lip portion of the entrance opening of the sliding groove portion 23.
[0040]
Next, the operation of this embodiment will be described.
[0041]
In order to press-fit the rubber bush B into the workpiece W, first, as shown in FIG. 3 (A), the sleeve 7 of the rubber bush B is attached to the bush mounting portion 4b of the ram 4, and the workpiece W is placed on the workpiece support base 1. Place.
[0042]
Next, the ram 4 is lowered. As a result, the rubber bush B is compressed by the tapered through hole 21 formed in the pressure guide member 20 below the inner diameter of the bush insertion hole Ow as shown in FIG. 24 is also lowered by the rubber bush B. In this case, the locking portion 24 is lowered in a state where the tip surface of the claw portion 24 b is in contact with the tip surface of the holder 28.
[0043]
In particular, in the present embodiment, when the claw portion 24b is engaged with the flange portion 28a of the holder 28, that is, when the lock mechanism 22 is activated, the downward movement of the pressure guide member 20 is configured to stop. .
[0044]
In this case, the distance L1 to the upper surface and the upper end surface of the rubber bush B of the pressure guide member 20 is set smaller than the distance L2 to the bottom edge of the lower end surface and the workpiece W of the pressure guide member 20 Yes.
[0045]
That is, if L1 <L2, the gap between the lower end surface of the pressure guide member 20 and the upper end surface of the workpiece W increases, so that when the pressure guide member 20 stops descending, the flange below the rubber bush B The part b1 is easily opened using this gap.
[0046]
When the ram 4 is lowered by a predetermined stroke t (overstroke), only the rubber bush B is lowered as shown in FIG. 3C, and the flange b1 below the rubber bush B is expanded by elasticity, Engage with the lower part of the workpiece W.
[0047]
When the ram 4 is raised after the engagement of the lower flange b1, the bush return member 5 and the arm 6 are raised as the ram 4 is raised.
[0048]
However, at the initial stage when the ram 4 is raised after the bush press-fitting and separated from the work support member 1, the bush return member 5 is not in contact with the work W as shown in FIG. Since it does not act on the locking portion 24, the claw portion 24 b of the locking portion 24 remains engaged with the flange portion 28 a, and the pressure guide member 20 is in a fixed position by the lock mechanism 22.
[0049]
Therefore, the rise of the ram 4 at this point makes the bush B easily detached from the ram 4 and improves workability.
[0050]
When the ram 4 is further raised, the bush return member 5 comes into contact with the rubber bush B and returns the rubber bush B upward by a predetermined amount as shown in FIG. As a result, the flange b2 above the rubber bush B expands and engages with the upper portion of the workpiece W. Thereby, the attachment of the rubber bush B to the workpiece W is completed.
[0051]
On the other hand, the arm 6 moves up through the holder 28, and the cam portion 6 b provided on the abdominal surface 6 a of the arm 6 acts on the locking portion 24 to lock against the elastic force of the first spring 25. The part 24 is pushed back, the engagement state between the claw part 24 b and the collar part 28 a is released, and the claw part 24 b comes into contact with the tip of the holder 28.
[0052]
As a result, the pressure guide member 20 is brought into a free state in which it can be raised and lowered, and the pressure guide member 20 that has pressed the workpiece W automatically creates an unclamped state by the elastic force of the second spring 27. Become. As a result, the worker can easily remove the workpiece W from the workpiece support 1.
[0053]
The present invention is not limited to the above-described embodiments, and various modifications can be used within the scope of the claims. For example, in the above-described embodiment, the ram 4 is configured to move up and down with respect to the work support base 1. However, not only this, the work support base 1 is configured to move up and down with respect to the ram 4. In some cases, both may be driven.
[0054]
Moreover, although embodiment mentioned above fits the rubber bush B with a hook with respect to a workpiece | work, this invention is not limited only to this, It is not necessary to have a hook and is normal. The cylindrical bush may be used as long as it has elasticity, and the material is not limited to rubber as long as it has elasticity, and various materials such as synthetic resin can be used.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line 2-2 of FIG.
FIG. 3 is a cross-sectional view showing stepwise the operating state of the embodiment.
FIG. 4 is a sectional view showing a conventional bush press-fitting device.
FIG. 5 is a cross-sectional equivalent view taken along line 5-5 in FIG. 6B, showing the relationship between the clamp member and the guide member.
FIG. 6 is a cross-sectional view showing an operation state of a conventional bush press-fitting device in stages.
[Explanation of symbols]
1 ... Work support base (work support member),
4 ... ram (holding member),
5 ... Bush return member,
6 ... arm,
6a ... cam part,
20: Pressure guide member,
21 ... Through hole (guide part),
22 ... Lock mechanism,
24 ... locking part,
28 ... Holder,
B ... Bush,
b1, b2 ... buttocks of the bush,
L1 ... Distance between the upper end surface of the pressure guide member and the upper end surface of the bush,
L2 ... Distance between the lower end surface of the pressure guide member and the upper end surface of the workpiece,
Ow… Bushing insertion hole,
R: Lock mechanism,
W ... Work.

Claims (3)

A holding member for holding a bushing made of an elastic member with both ends flanged, when descending toward the workpiece support member workpiece is placed, press-fitting the bushing in the reduced diameter and the bushing insertion hole opened in the work In the bush press-fitting device,
A guide portion that reduces the diameter of the bush and guides it to the bush insertion hole and a clamp portion that clamps the work on the work support member are integrally formed, and the holding is performed by relative movement of the holding member and the work support member. The workpiece is clamped between the workpiece and the workpiece support member, and the workpiece is clamped between the workpiece support member and the workpiece is separated from the workpiece on the workpiece support member by the relative separation operation of the holding member and the workpiece support member. A pressure guide member disposed so as to be movable up and down between the holding member and the work support member so as to place the work in an unclamped state;
A locking mechanism that is provided on the pressure guide member, and when the bush is press-fitted into the bush insertion hole, the pressure guide member itself cannot be retracted to the opposite side of the press-fitting direction ;
It is provided in the work support member so as to be movable up and down, acts on a bush press-fitted into the bush insertion hole from below, and returns the bush upward to engage the upper brim of the brim with the work. A bush return member to be combined,
Have
When the holding member descends, the lower end of the bush descends beyond the bush insertion hole of the workpiece to engage the lower brim portion of the brim portion with the workpiece, and when the raising member rises, A bush press-fitting device, wherein an arm connecting the bush return member and the holding member releases the lock of the lock mechanism.   The locking mechanism includes a locking portion provided so as to be able to protrude and retract from the pressure guide member, a holder that is locked when the locking portion protrudes, and that holds the arm at one end; 2. The bush press-fitting device according to claim 1, further comprising: a cam portion provided on the arm so as to release a locked state due to the locking of the locking portion and the holder by the lifting and lowering operation of the arm.   The pressure guide member has a distance (L1) between the upper end surface of the pressure guide member and the upper end surface of the bush when the locking portion is locked to the holder. The bush press-fitting device according to claim 1 or 2, wherein the bush press-fitting device is configured to be smaller than a distance (L2) between the end surface and the lower end surface of the workpiece.

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