JP2962128B2 - Spindle press-fit device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a press-fitting device for a spindle, and more particularly to a press-fitting device for press-fitting a component such as a spindle into an end of a rod-like member having poor rigidity.

[0002]

2. Description of the Related Art For example, in a motor vehicle, a torsion beam (also referred to as a torsion bar) which elastically supports wheels and functions as a cushioning member is provided with a spindle for rotatably supporting a wheel hub on which a tire is mounted. Has been fixed.

[0003] In addition to such torsion beams, those used as cushioning members and elastic members are made of a material having a high elasticity such as spring steel, and are deformed by a relatively small force. Therefore, in order to prevent deformation of the torsion beam during the operation of attaching the spindle, welding or bolting has conventionally been generally employed as a method of attaching the spindle.

[0004]

However, if the spindle is attached to the end of the torsion beam by welding or bolting, distortion due to welding or eccentricity due to bolt tightening may occur, and the quality of spindle mounting varies. easy. For example, when assembling a suspension using a torsion bar mounted with the spindle displaced, the alignment elements such as the toe angle and camber angle of the tire will change, adversely affecting the balance and steering wheel operability of the car Will be. Also, when installing the spindle by bolting,
There is a problem that the number of parts increases.

As a result of repeated studies in view of such problems, a spindle mounting method by press fitting has been proposed as a spindle mounting method capable of stabilizing the mounting quality and preventing an increase in the number of parts. However, the torsion bar is made of a spring steel having high elasticity such as SUP-9, and is generally a long member. Therefore, the rigidity is poor. A problem arises in that the bar is distorted and the mounting state of the spindle varies.

As described above, an object of the present invention is to provide an apparatus for attaching a spindle or the like to an end of a rod-like member having a poor rigidity and a long length, such as a torsion bar, by press-fitting the spindle. And

[0007]

To achieve the above object, the present invention provides a press-fitting hole formed at both ends of a rod-shaped press-fitted member.
Spindle press-fit to press each spindle into
An apparatus, comprising:
It is installed so that it can move close to and away from each other.
A pair of movable arms biased in a relative approach direction;
Each of the pair of movable arms has a longitudinal direction
Pair movably mounted in the vertical and its vertical direction
Jig slide and the pair of jig slides respectively
A pair of press-fitting members,
Centering pins and the pair of jig slides
Provided in parallel with the
Are pivotally held on the spindle press-fitting shaft, respectively.
A pair of spindle holding members and a pair of movable arms;
Provided at the opposed inner portions, respectively, of the pressed-in member.
By sandwiching each convex portion formed at both ends, the pressed-in member is
A pair of press-fitted member holding means for holding, and the pair of movable members
The jig slide is provided on each of the arms.
A pair of longitudinal directions moved along the longitudinal direction of the press-fitting member
Moving means, respectively provided on the pair of movable arms.
And vertically moving the jig slide in the longitudinal direction of the member to be pressed.
A pair of vertical moving means for moving along a straight direction
And having the following.

[0008]

In the spindle press-fitting device according to the present invention having such features, when the spindle is carried on the spindle press-fitting shaft, the pair of centering pins are moved relatively close to each other.
It engages the press-fitting holes formed at both ends of the press-fitting member, the pressure
Position the entry member . Further brought relative approach movement in the state in which the centering pin has engaged in the press-fit hole of the press-fitting member <br/>
Then, the movable arm moves backward against the urging force of the urging means . Therefore , the pressed-in member is held by the urging force of the urging means . Subsequently, by the pressed-in member holding means ,
The protrusion formed at the end of the press-fitted member is sandwiched, and the engagement between the centering pin and the press-fitting hole is released. Then the vertical
Use a direction moving means and replace the centering pin with a spin
The dollar holding member is moved on the spindle press-fitting shaft. Soshi
And move the jig slide using the longitudinal movement means.
Presses the spindle holding member toward the member to be pressed.
By doing so, the spindle is press- fitted into the press-fitting hole of the press- fitted member . Use this manner, the convex portion formed on the end portion of the press-fitting member by <br/> retained by pressed insertion member retaining means provided on the movable arm, also the moving means provided on the movable arm
Since the spindle is press-fitted, almost no load is applied to the main body of the press-fitted member at this time. When the spindle is held by the spindle holding member so that it can swing freely,
A press- fit hole is formed in the press- fitted member into which the spindle is pressed.
Since the orientation of the spindle naturally matches according to the variation of the press-fitting seat surface , the spindle is press- fitted in a state in which the spindle is in close contact with the press-fitting seating surface .

[0009]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic side view showing a spindle press-fitting device of an embodiment, and FIG. 2 is an enlarged side sectional view showing a press-fitting unit shown on the right side in FIG. 3 is a view in the direction of arrow P showing the jig slide, FIG. 4 is a view in the direction of arrow XX showing the jig slide, and FIG. 5 is a side sectional view of the spindle holding member and FIG. 6 (A) is a side sectional view showing a clamper, FIG. 6 (B) is a YY side view showing a first holding member, and FIG. 6 (C) is a ZZ side view showing a second holding member. is there.

As shown in FIG.
The torsion beam (press-fitted member) W
A support unit 13 that supports the torsion beam W mounted on the support unit 13 is provided on a column 15 erected on both sides of the support unit 13.
A lifter L is provided to move the lifter to a position A on the spindle press-fitting shaft. Further, on the base 11, a press-fitting unit including left and right units U1 and U2 for press-fitting the spindle S into the torsion beam W conveyed on the spindle press-fitting shaft A is installed.

FIG. 2 is an enlarged side sectional view showing the press-fit unit U1 shown on the right side in FIG. Note that the left press-fit unit U2 is symmetrical to the right press-fit unit U1, and a description thereof is omitted. As shown in FIG. 2, the unit base 21 on the base 11 has a first LM extending along the longitudinal direction of the carried-in torsion beam W.
A guide 23 is laid, and the first LM guide 23
Guides the movable arm 25 in sliding contact so as to be able to move forward and backward. The movable arm 25 is urged in the forward movement direction by a compression coil (urging means) 27 that comes into contact with the rear end. A second LM guide 29 is laid on the movable arm 25 along the angle of the torsion beam W carried in. The second LM guide 29 includes a third LM guide 31 extending in a direction perpendicular to the second LM guide 29.
3 and 4, a jig slide 33 that moves along the third LM guide 31 has a centering pin 35 and a spindle holding member 37 that extend in the reciprocating direction. And are projected in parallel. Therefore, by moving the jig slide 33 along the third LM guide 31 by the slide cylinder 38, either the centering pin 35 or the spindle holding member 37 can be selectively positioned on the spindle press-fitting shaft A. .

As shown in FIG. 2, the centering pin 35 has a truncated conical tip having a smaller diameter toward the tip. Therefore, when the two centering pins (the left ones are not shown) of the spindle press-fitting shaft A are moved relatively close to both ends of the torsion beam W on the spindle press-fitting shaft A, the torsion beam A becomes
In the press-fit holes H formed at both ends, the centering pins 35 hold the scoop-up so as to be scooped up, and are positioned with a predetermined alignment.

As described above, since the movable arm 25 is urged in the forward moving direction by the compression coil 27, the centering pin 35 is engaged with the press-fit hole H at the torsion beam end We, and then is moved to the movable arm 25. When the movable arm 25 further moves forward relatively, the movable arm 25 moves backward against the urging force of the compression coil 27. Therefore, after the centering pin 35 and the press-fit hole H are engaged, the centering pin 3
Even when 5 moves forward relative to movable arm 25 to a predetermined position, torsion beam W is not compressed and distorted by the driving force of first cylinder 39. Further, since the urging force of the compression coil 27 is set to a value that can scoop up the torsion beam W and does not deform it, the torsion beam W is not distorted by this force.

FIG. 5 is a side sectional view showing the spindle holding member. As shown, the spindle holding member 37
Has an outer 41 having a substantially cylindrical outer shape. The outer 41 has a hollow portion with one end opened, and a spindle holder 43 having an internal shape corresponding to the shape of the non-press-fit portion of the spindle S is mounted in the hollow portion.
That is, the spindle S is held in a state where the press-fitted portion is inserted into the spindle holder 43. Further, the spindle holder 43 has a spherical step portion 43a, and is in sliding contact with a spherical portion formed on the edge 41a of the outer 41. Therefore, it can swing freely around the ball center of the sliding contact surface as the swing center. The swing center position is a position shown as a point C in FIG. 5, that is, a position on the spindle corresponding to the center of the opening of the press-fitting hole H at the time of press-fitting.

When the centering pin 35 is engaged with the press-fit hole H at the torsion beam end We to set the alignment of the torsion beam W, the center position of the press-fit hole H is always positioned at a fixed position. , With the center of the press-fit hole H as a reference. That is,
If the spindle S is held so that the position on the spindle side corresponding to the center of the press-fit hole H becomes the swing center C as in the present embodiment, it is possible to cope with misalignment in any direction, and the spindle S is always inserted into the press-fit hole. It can be press-fitted in a state of being in close contact with H. The outer 41 and the spindle holder 4
When two cushioning materials 45 made of urethane rubber are interposed at a predetermined interval between the outer 41 and the spindle holder 4.
3 is prevented.

As shown in FIG. 2, a pressing member 47 which moves forward and backward along the second LM guide 29 is provided behind the jig slide 33 to which the centering pin 35 is attached. When the jig slide 33 is pressed and moved forward by the pressing member 47, the spindle S held by the spindle holding member 37 is pressed into the press-fit hole H of the torsion beam W. In addition, a load cell 49 is attached to the contact surface of the pressing member 47 with the jig slide 33, and detects and manages the pressing force.

Further, as shown in FIG. 2, a clamper 53 is provided on the second LM guide 29 of the movable arm 25 so as to be moved forward and backward by a second cylinder 51. As shown in FIG. 6, on the front surface of the clamper 53, a first sandwiching member 55 that is in contact with one surface of a flange portion F formed at an end We of the torsion beam W is attached.
Therefore, when the first clamping member 55 is moved forward toward the torsion beam W, the flange portion F of the torsion beam W is attached to the movable arm 25 and the second clamping member 57 abuts on the other surface of the flange portion F. Is held by the clamping pressure. As described above, since the movable arm 25 is urged in the forward moving direction by the compression coil 27, the first holding member 55 is movable after the torsion beam W is squeezed and held by the squeezing members 55 and 57. When the movable arm 25 further moves forward relative to the arm 25, the movable arm 25 moves backward against the urging force of the compression coil 27, so that the torsion beam W is not compressed by the pressing force of the second cylinder 51.

As described above, in the spindle press-fitting device 1 of the present embodiment, the flange portion F formed at the end We of the torsion beam W is squeezed and held by the two squeezing members 55 and 57 attached to the movable arm 25. In this state, the spindle S is press-fitted into the press-fit hole H at the end We, so that almost no load is applied to the main body of the torsion beam W.
Therefore, a press-fitting member such as the spindle S can be press-fitted into a member having rigidity and low compressive strength such as the torsion beam W.

The operation of press-fitting a spindle into a torsion beam by such a spindle press-fitting device will be described. When the lifter L is lifted and the torsion beam W mounted on the lifter L is carried into the spindle press-fitting shaft A, first, the pair of centering pins 35 located on the spindle press-fitting shaft A are moved relatively close to each other. The torsion beam W is engaged with the press-fit holes H formed at both ends of the torsion beam W to position the torsion beam W at a predetermined alignment. At this time, the torsion beam W is pulled up from the lifter L and held by the distal end portion of the truncated conical centering pin 35 in the press-fit holes H at both ends.

The jig slide 33 to which the centering pin 35 is attached moves forward relative to the movable arm 25 to a predetermined position even after the centering pin 35 is engaged with the press-fit hole H. The movable arm 25 moves backward against the urging force of the compression coil 27. The centering pin 35 causes the torsion beam W
Can be scooped up. The biasing force of the compression coil 27 is set in advance to a value that does not deform the torsion beam W. Further, with this configuration, the torsion beam W is not compressed by the driving force of the first cylinder 39 that moves the jig slide 33 forward,
There is no deformation.

When the alignment of the torsion beam W is completed, the clamper 53 having the first clamping member 55 attached to the front surface is then moved to the second cylinder 51 by the second cylinder 51.
The torsion beam is moved forward along the M guide 29 to abut on one surface of the flange F of the torsion beam end We. The clamper 53 moves forward relative to the movable arm 25 to a predetermined position even after the first holding member 55 contacts the one end face of the flange portion F, so that the movable arm 25 is compressed after the contact. It moves backward against the urging force of the coil 27. That is,
After the contact, the second pressing member 57 attached to the movable arm 25 is moved toward the other end surface of the flange F, and the torsion beam W is moved in cooperation with the first pressing member 55.
The clamping pressure is held at the flange portion F. Both pinching members 55,
When the flange portion F of the torsion beam W is pinched and held by 57, the jig slide 33 is moved backward to release the engagement between the centering pin 35 and the press-fit hole H at the end We of the torsion beam W.

Thereafter, the jig slide 33 is moved along the third LM guide 31 by the slide cylinder 38, and the spindle holding member 37 already holding the spindle S is positioned on the spindle press-fitting shaft A. Next, the pressing member 47 is moved to the jig slide 33 by the press-fitting cylinder 59.
To press the spindle S held by the spindle holding member 37 into the press-fit hole H formed at the end of the torsion beam W.

As shown in FIG. 5, the spindle holding member 43 of the spindle holding member 37 is swingably attached to the outer 41, and the base end of the press-fitted portion of the spindle S to be held. Is set as the swing center C. That is, when the torsion beam W is aligned by engaging the centering pin 35 with the press-fitting hole H as in the present embodiment, the positioning is performed with reference to the opening of the press-fitting hole H. At the position C, almost no deviation appears. Therefore, by pivoting the spindle S about the center of the opening where no deviation appears as the rotation center C, any deviation can be dealt with, and the spindle S can be press-fitted into the press-fit hole H with the spindle S in close contact.

As described above, in the spindle press-fitting device according to the present embodiment, the spindle is press-fitted while holding the flange portion at the end of the torsion beam at the clamping pressure. As described above, a member such as a spindle can be pressed into a member having low strength against compression.

Further, before press-fitting the spindle, it can be confirmed that the spindle and the press-fitting hole are accurately machined. That is, since the spindle is mounted after machining both members accurately, high machining accuracy can be achieved. It can be obtained stably, and the accuracy of alignment elements such as toe angle and camber angle can be improved. Further, since the torsion beam and the spindle are welded after the spindle press-fitting, a high mounting strength can be stably obtained, and extremely high stability can be secured as an important security component.

A load cell for measuring the pressing pressure is provided on the contact surface of the pressing member with the jig slide, so that the pressure at the time of pressing can be controlled. Therefore, it is possible to quickly respond to abnormal pressure.

[0027]

As described above, according to the present invention, the press-fitted portion
It is provided with a convex portion formed on the end portion of the timber to the movable arm
It is held by the press-fitting member holding means and
Since the spindle is press-fitted using the provided moving means, almost no load is applied to the main body of the press-fitted member at the time of press-fitting . Therefore, even members rigidity is small, it is possible to press-fit the press-fitting member such as a spindle. Also, when the spindle is held by the spindle holding member so as to be swingable , the direction of the spindle is swung according to the variation in the press-fitting seat surface in which the press-fitting hole of the press- fitted member into which the spindle is pressed is formed. since the suit, this spindle
Press-fitting can be performed in a state of being closely attached to the press-fitting seating surface .

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a spindle press-fitting device according to an embodiment.

FIG. 2 is an enlarged side sectional view showing the press-fit unit shown on the right side in FIG.

FIG. 3 is a view in the direction of arrow P showing a jig slide.

FIG. 4 is an XX view showing the jig slide.

FIG. 5 is a side sectional view of a spindle holding member.

6A is a side sectional view showing a clamper, FIG. 6B is a YY side view showing a first holding member, and FIG. 6C is a ZZ side view showing a second holding member.

[Explanation of symbols]

23: first LM guide, 25: movable arm, 2
9: 2nd LM guide, 31: 3rd LM guide, 33 ...
Jig slide, 35: Centering pin, 37: Spindle holding member, 38: Slide cylinder, 43: Spindle holder, 45: Shock absorber, 55: First holding member, 57: Second holding member, A: Spindle press-fit shaft , C: swing center, F
... flange, H ... press-fit hole, S ...
Spindle, W ... torsion beam.

Claims (1)

(57) [Claims] 1. A rod-shaped press-fit member is formed at both ends.
Spin for press-fitting spindle into each press-fitting hole
A dollar press-fitting device, which moves relatively close to and away from the press-fitted member in a longitudinal direction thereof.
In the direction of relative approach by biasing means.
A pair of movable arms to be urged, and each of the pair of movable arms,
Movably mounted in the longitudinal direction and its vertical direction
And a pair of jig slides respectively provided on the pair of jig slides.
A pair of centering pins that engage with each press-fit hole of the fitting member
And the pair of jig slides are arranged in parallel with the centering pins.
The spindle is press-fitted to the spindle
A pair of spindle holders that hold each of them so that they can swing freely
A member and a pair of movable arms provided at opposed inner portions, respectively.
And each of the protrusions formed at both ends of the member to be pressed is sandwiched.
Holding the pair of press-fitted members
And a jig slide provided on each of the pair of movable arms.
Move the ride along the longitudinal direction of the member to be pressed
A pair of longitudinal movement means and a pair of movable arms, respectively,
Ride along the direction perpendicular to the longitudinal direction of the pressed-in member
And a pair of vertical moving means for moving the spindle press-fitting device.